AccusizeTools - 12 Pcs/Set ER32 Collet + R8 Bridgeport Shank + Wrench in Fitted Box, 0223-0974 Size:ER-32,Range:R8x4", ANSI standard. Includes 12 ps/set ER32 collet as 3/32, 1/8'', 3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', and 3/4' Complete kits include: chuck holder, nominal size collets, non-slip spanner wrench, and case Accuracy to 0.0004''. Unique self-releasing system eliminates sticking. Suitable for all milling and drilling operations. Flute holding capability for the highest concentricity and clamping power.